Those are very interesting details, thanks.
As you are at the coal face so to speak I
will not try to teach you your job but they do
not rule out the idea as far as I can see. I
hope "wacky" indicates a slight, growing
appreaciation of the explanation. I read that
all six types of neutrino are in the burst
and perhaps white dwarfs act as catalysts to
recreate in a small way some of the things that
happened when they were created! I would say
a shock front is caused in the star that
causes material to spall from the exit side
temporally and give out X-rays as it falls
back on the surface. This could explain some
high energy bursts. But this is only one
mechanism I suspect. There are surely others!